Which frame is NOT part of the transverse watertight bulkheads?

The transverse watertight bulkheads on a vessel are designed to enhance its structural integrity and limit flooding in case of breaches in the hull. These bulkheads are numbered sequentially from the bow (front) to the stern (rear) of the ship, and each frame corresponds to a specific location in relation to the overall design of the ship.

In the context of the question, the frame that is not part of the transverse watertight bulkheads is frame 90. This frame is typically located in areas of the ship that do not require watertight integrity as critical as other sections, such as near the midship or in the engine room, where different structural and safety considerations apply. The other frames, namely 9, 76, and 88, are commonly found to be integral parts of the watertight divisions essential for preventing the spread of water in case of an emergency, thus maintaining buoyancy and stability of the vessel.

Understanding the layout of bulkheads and their respective frame numbers is crucial for ship safety and design, as knowing which areas are watertight can significantly impact emergency protocols and the overall safety management of the vessel.